I doubt you can find stage 1 through Linux. If it appears before grub it has nothing to do with your installed OS. You might be able to find it in your BIOS's logs.
As for stage 3, you can find that text in /var/log/boot.log
. For example, here are the 1st 20 lines of mine (yours will be different of course):
$ head -20 /var/log/boot.log
Scanning for Btrfs filesystems
resume: libgcrypt version: 1.5.3
[e4rat-preload] Open /var/lib/e4rat/startup.log ...
[e4rat-preload] 6693 files scanned
[e4rat-preload] Pre-loading I-Nodes ...
[e4rat-preload] Execute `/sbin/init' ...
[e4rat-preload] Pre-loading file content ...
INIT: version 2.88 booting
[info] Using makefile-style concurrent boot in runlevel S.
[e4rat-preload] Successfully transferred files into page cache
[ ok ] Reading early boot files....
[ ok ] Starting the hotplug events dispatcher: udevd.
[ ok ] Synthesizing the initial hotplug events...done.
[ ok ] Waiting for /dev to be fully populated...done.
[ ok ] Activating swap...done.
[....] Checking root file system...fsck from util-linux 2.20.1
/dev/sda7: clean, 581416/4505600 files, 6554372/18013696 blocks
done.
[ ok ] Activating lvm and md swap...done.
[....] Checking file systems...fsck from util-linux 2.20.1